LXR linux/drivers/gpu/drm/nouveau/nvkm/subdev/therm/nv50.c

   1/*
   2 * Copyright 2012 Red Hat Inc.
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a
   5 * copy of this software and associated documentation files (the "Software"),
   6 * to deal in the Software without restriction, including without limitation
   7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 * and/or sell copies of the Software, and to permit persons to whom the
   9 * Software is furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20 * OTHER DEALINGS IN THE SOFTWARE.
  21 *
  22 * Authors: Ben Skeggs
  23 *          Martin Peres
  24 */
  25#include "priv.h"
  26
  27static int
  28pwm_info(struct nvkm_therm *therm, int *line, int *ctrl, int *indx)
  29{
  30        struct nvkm_subdev *subdev = &therm->subdev;
  31
  32        if (*line == 0x04) {
  33                *ctrl = 0x00e100;
  34                *line = 4;
  35                *indx = 0;
  36        } else
  37        if (*line == 0x09) {
  38                *ctrl = 0x00e100;
  39                *line = 9;
  40                *indx = 1;
  41        } else
  42        if (*line == 0x10) {
  43                *ctrl = 0x00e28c;
  44                *line = 0;
  45                *indx = 0;
  46        } else {
  47                nvkm_error(subdev, "unknown pwm ctrl for gpio %d\n", *line);
  48                return -ENODEV;
  49        }
  50
  51        return 0;
  52}
  53
  54int
  55nv50_fan_pwm_ctrl(struct nvkm_therm *therm, int line, bool enable)
  56{
  57        struct nvkm_device *device = therm->subdev.device;
  58        u32 data = enable ? 0x00000001 : 0x00000000;
  59        int ctrl, id, ret = pwm_info(therm, &line, &ctrl, &id);
  60        if (ret == 0)
  61                nvkm_mask(device, ctrl, 0x00010001 << line, data << line);
  62        return ret;
  63}
  64
  65int
  66nv50_fan_pwm_get(struct nvkm_therm *therm, int line, u32 *divs, u32 *duty)
  67{
  68        struct nvkm_device *device = therm->subdev.device;
  69        int ctrl, id, ret = pwm_info(therm, &line, &ctrl, &id);
  70        if (ret)
  71                return ret;
  72
  73        if (nvkm_rd32(device, ctrl) & (1 << line)) {
  74                *divs = nvkm_rd32(device, 0x00e114 + (id * 8));
  75                *duty = nvkm_rd32(device, 0x00e118 + (id * 8));
  76                return 0;
  77        }
  78
  79        return -EINVAL;
  80}
  81
  82int
  83nv50_fan_pwm_set(struct nvkm_therm *therm, int line, u32 divs, u32 duty)
  84{
  85        struct nvkm_device *device = therm->subdev.device;
  86        int ctrl, id, ret = pwm_info(therm, &line, &ctrl, &id);
  87        if (ret)
  88                return ret;
  89
  90        nvkm_wr32(device, 0x00e114 + (id * 8), divs);
  91        nvkm_wr32(device, 0x00e118 + (id * 8), duty | 0x80000000);
  92        return 0;
  93}
  94
  95int
  96nv50_fan_pwm_clock(struct nvkm_therm *therm, int line)
  97{
  98        struct nvkm_device *device = therm->subdev.device;
  99        int pwm_clock;
 100
 101        /* determine the PWM source clock */
 102        if (device->chipset > 0x50 && device->chipset < 0x94) {
 103                u8 pwm_div = nvkm_rd32(device, 0x410c);
 104                if (nvkm_rd32(device, 0xc040) & 0x800000) {
 105                        /* Use the HOST clock (100 MHz)
 106                        * Where does this constant(2.4) comes from? */
 107                        pwm_clock = (100000000 >> pwm_div) * 10 / 24;
 108                } else {
 109                        /* Where does this constant(20) comes from? */
 110                        pwm_clock = (device->crystal * 1000) >> pwm_div;
 111                        pwm_clock /= 20;
 112                }
 113        } else {
 114                pwm_clock = (device->crystal * 1000) / 20;
 115        }
 116
 117        return pwm_clock;
 118}
 119
 120static void
 121nv50_sensor_setup(struct nvkm_therm *therm)
 122{
 123        struct nvkm_device *device = therm->subdev.device;
 124        nvkm_mask(device, 0x20010, 0x40000000, 0x0);
 125        mdelay(20); /* wait for the temperature to stabilize */
 126}
 127
 128static int
 129nv50_temp_get(struct nvkm_therm *therm)
 130{
 131        struct nvkm_device *device = therm->subdev.device;
 132        struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
 133        int core_temp;
 134
 135        core_temp = nvkm_rd32(device, 0x20014) & 0x3fff;
 136
 137        /* if the slope or the offset is unset, do no use the sensor */
 138        if (!sensor->slope_div || !sensor->slope_mult ||
 139            !sensor->offset_num || !sensor->offset_den)
 140            return -ENODEV;
 141
 142        core_temp = core_temp * sensor->slope_mult / sensor->slope_div;
 143        core_temp = core_temp + sensor->offset_num / sensor->offset_den;
 144        core_temp = core_temp + sensor->offset_constant - 8;
 145
 146        /* reserve negative temperatures for errors */
 147        if (core_temp < 0)
 148                core_temp = 0;
 149
 150        return core_temp;
 151}
 152
 153static void
 154nv50_therm_init(struct nvkm_therm *therm)
 155{
 156        nv50_sensor_setup(therm);
 157}
 158
 159static const struct nvkm_therm_func
 160nv50_therm = {
 161        .init = nv50_therm_init,
 162        .intr = nv40_therm_intr,
 163        .pwm_ctrl = nv50_fan_pwm_ctrl,
 164        .pwm_get = nv50_fan_pwm_get,
 165        .pwm_set = nv50_fan_pwm_set,
 166        .pwm_clock = nv50_fan_pwm_clock,
 167        .temp_get = nv50_temp_get,
 168        .program_alarms = nvkm_therm_program_alarms_polling,
 169};
 170
 171int
 172nv50_therm_new(struct nvkm_device *device, int index,
 173               struct nvkm_therm **ptherm)
 174{
 175        return nvkm_therm_new_(&nv50_therm, device, index, ptherm);
 176}
 177